It was a rainy day and my friends and I were waiting for a bus at the school gate. We stood in the rain with umbrellas. It was a little cold, but it was also very lively. Suddenly, we heard a voice. It was a strange man who was walking towards us with an umbrella. "Hello, classmate." He said in a hoarse voice. We were a little surprised and didn't know who this person was. "I'm a teacher at your school." He told us,"I need your help." We were a little hesitant and didn't know what to do. However, we don't want to miss any opportunity. "What can you help us with?" we asked. "I need you to help me deliver this letter to the principal." he said, handing us a letter. We were a little confused as to what this letter meant. But we still took it. We didn't know what to do, but we knew we needed help. So we decided to help this teacher. We found the headmaster and handed him the letter. After reading the letter, the headmaster said to us,"Thank you for your help." We'll deal with this matter as soon as possible." We felt very happy because we had succeeded in helping the teacher. We stood in the rain and looked at each other. We know we are no longer strangers. We've established a connection. We can communicate through letters. "You know what?" We said,"That rainy day changed our lives." We don't know the details, but we know that rainy day made us meet and become friends. So we continued to wait for the next rainy day. We don't know what will happen in the future, but we know we can face any challenge together.